diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index da6f006..be71493 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,7 +13,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744
 
       - name: Install software
         run: |
diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
index 32970c2..e2bb983 100644
--- a/.github/workflows/pr.yml
+++ b/.github/workflows/pr.yml
@@ -10,7 +10,7 @@ jobs:
 
     steps:
       - name: Checkout PR
-        uses: actions/checkout@v3
+        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744
 
       - name: Install software
         run: |